PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 82

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Semiconductor Group
3.6.4
Note 18: This section applies only in the NT, NT-Auto Activation, NT-RP and TE
The IOM
Machine in NT Modes", page 160). This reduces power consumption to a minimum. In
this deactivated state the clock lines are low and the data lines are high. The power-down
condition within the ’Deactivated’ state will only be entered if no Monitor messages are
pending on IOM
For information on how to keep the IOM
application note ’Providing Clocks in Deactivated State’.
The deactivation procedure is shown in Figure 31. After detecting the code DI
(Deactivation Indication) the IEC-Q responds by transmitting DC (Deactivation
Confirmation) during subsequent frames and stops the timing signals after the fourth
frame.
Figure 31
The IOM
apply
• the DIN line is pulled low
a)
FSC
DIN
DOUT
b)
DCL
DIN
®
®
-2 clocks may be switched off if the IEC-Q is in state ’Deactivated’ (see "State
-2 clocks are activated automatically when one of the following conditions
modes.
Activation/Deactivation of IOM
Deactivation of the IOM
®
DR
DI
-2.
D
DR
DI
C /
DC
DI
®
®
-2 Clocks
-2 clocks active in all states please refer to the
/ C
82
DC
DI
®
-2 Clocks
/ C
DC
DI
/ C
Detail see Fig.b
Functional Description
DC
DI
ITD10292
IOM -2 Interface
deactivated
IOM -2 Interface
deactivated
Data Sheet 01.99
R
R
PEB 2091
PEF 2091